.inchfrac member for formatting inch values as mixed fractional

ParametricText.py

@@ -59,6 +59,7 @@
 importlib.reload(thomasa88lib.settings)
 
 from . import paramparser
+from . import paramformatter
 
 MAP_CMD_ID = 'thomasa88_ParametricText_Map'
 MIGRATE_CMD_ID = 'thomasa88_ParametricText_Migrate'
@@ -831,6 +832,7 @@ def sub_func(subst_match):
             member_sep = ''
             member = ''
 
+        # Strings can be sliced
         string_value = False
 
         if var_name == '_':
@@ -918,6 +920,8 @@ def sub_func(subst_match):
                 value = param.expression
             elif member == 'unit':
                 value = param.unit
+            elif member == 'inchfrac':
+                value = paramformatter.mixed_frac_inch(param, design)
             else:
                 return f'<Unknown member of {var_name}: {member}>'
 

README.md

@@ -20,3 +20,9 @@ https://parametrictext.readthedocs.io/en/stable/
 [My Fusion 360™ app store page](https://apps.autodesk.com/en/Publisher/PublisherHomepage?ID=JLH9M8296BET)
 
 [All my add-ins on Github](https://github.com/topics/fusion-360?q=user%3Athomasa88)
+
+## Development
+
+### Running tests
+
+Currently, each unit test file is self-contained. Just execute each file with Python.

paramformatter.py

@@ -0,0 +1,61 @@
+# This file is part of Parametric Text, a Fusion 360 add-in for creating text
+# parameters.
+#
+# Copyright (c) 2020 Thomas Axelsson
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+# Helper functions for formatting parameter values
+
+import math
+import fractions
+
+def mixed_frac_inch(param, design):
+    if param.unit == '':
+        # Unit-less
+        inch_value = param.value
+    else:
+        inch_value = design.fusionUnitsManager.convert(param.value, 'internalUnits', 'in')
+
+    sign_char = ''
+    if math.copysign(1, inch_value) < 0:
+        sign_char = '-'
+
+    # Convert the number to a fractional number ("1.75" to "1 3/4")
+    frac = abs(fractions.Fraction(inch_value).limit_denominator())
+
+    # Get the integer part ("1" from "1 3/4"), if it's not 0.
+    int_part = int(frac)
+
+    # Get the fractional part ("3/4" from "1 3/4"), if it's not 0.
+    fractional_part = frac % 1
+
+    value = sign_char
+    if int_part == 0 and fractional_part == 0:
+        value += '0'
+    elif int_part == 0:
+        value += str(fractional_part)
+    elif fractional_part == 0:
+        value += str(int_part)
+    else:
+        value += f'{int_part} {fractional_part}'
+    value += '"'
+
+    # Build the mixed fraction ("(-)1 3/4")
+    return value

paramparser.py

@@ -1,3 +1,26 @@
+# This file is part of Parametric Text, a Fusion 360 add-in for creating text
+# parameters.
+#
+# Copyright (c) 2020 Thomas Axelsson
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
 import re
 
 # <var>[.<member>][<slice range>][:<format>]